Blast torch



Nov. 30, 1948. s. c. BRO-DY r 2,455,229

BLAST TORCH Filed May 29, 1947 INVENTOR.

,fi'amuel 6'. Brag.

A TTORNE Patented Nov. 30, 1948 UNITED STATES PATENT OFFICE 4 BLAST 'IORCH Samuel C. Brody, Newton, Mass.

Application May 29, 1947, Serial No. 751,344

This torches of the self-generating type which employ a combustion burner assembled to a pressuregenerating unit for creating a blast flame with means for initially priming the same.

An important object of my invention is to provide a torch which will produce in the minimum time and maintain in any and all positions-in which the torch may be operated a continuous, uniform and steady blast flame of maximum intensity,

Another important object is to provide a continuous and intense heat that is carried back by the combustion burner to the pressure-generating tube (or so-called wick tube or gooseneck), as well as to the casing itself which houses the fuel. In a few minutes such heat causes the fuel to be vaporized and permits the blast flame to reach its maximum blast intensity, which is then continuously maintained until all the fuel has been exhausted or the torch is extinguished.

Another object is to greatly simplify: the mechanical construction of the torch and thereby substantially reduce its manufacturing cost.

Other objects and features of superiority of my present torch over torches now on the market will appear as this description proceeds. I

In attaining my objects and advantages I construct my torch in such a manner as toefliciently utilize (after priming) the heat developed by the combustion burner for quickly and thoroughly volatilizing the fuel into gas supplied to .the burner from the fuel chamber of the torch before the fuel reaches said burner and is combusted.

passing along the pressure-generating tube which connects said chamber with the combustion burner.

Alternatively I may provide a barrier within the casing which subdivides the casing when so arranged into a fuel chamber and a superposed gas chamber.

As a result of this construction when-the fuel is changed into gas and reaches the combustion burner it is thoroughly and intensely volatilized into a superheated gas and is in a condition best suited for mixture with the air for supporting maximum combustion in the-burnerand thuswill produce a steady, continuous and superintense blast flame emitting from the discharge end as well as from the holes of the burner.

My torch is extremely simple in construction and very safe and reliable in operation. 1 Because combustion Claims. (01. 158-35) invention relates to automatic blast of its extremelyefiicient action in causing high volatilization of the fuel. the fuel gases are delivered continuously to the combustion burner at a continuously increasing rate until the maximum combustion is attained, thus substantial y reducfng fuel loss and consumption as well as assuring smooth and intense blast-flame operating efficiency. My torch'is extremely compact in design and may be manufactured-at much lower cost than torches now'on the market. For the super-intensity ofits blast flame, my torch is much lighter in weight than any self-generating torch of the nearest comparable blast flame intensity now in use.

In carrying out my present invention, I preferably locate the combustion burner, in part at least, within a heating chamber which'preferably overlies the top and closure of the fuel chamber in close proximity thereto, and I connect the gas intake end of saidburn'er to the pressure generating tube of the torchwhich likewise is located,

in part at least, within said heating chamben.

So mounted, the burner; when operating causes heat from the blast :flame .comingthrough some of the holes in the burner to play against said closure as well as heating by conduction the pressure generating tube and easing wall and thereby quickly, thoroughly andintenselyvolatilizing the fuel into gas before it is delivered by the pressure generating tube to the burner for combustion therein. I

In the accompanying drawing wherein I have illustrated several embodiments of my invention.

Figs. 1 and 2 are, respectively, a top plan and a sectional elevation of one form ,ofmy torch.

Fig. 3 is a detail view of a jet unit which may be used with any of the forms of my torch.

Fig. 4 is a sectional elevation of a modified form of torch, and 1 Figs. 5 and 6 are,-respectively, a top plan and a sectionalized elevation of a still further modification.

I have indicated generally at I B the pressure generating unit of anautomatic blast torch of the self-generating type. Unit Ill includes a casing, which may be of cylindrical, oval or other cross-section, and is formed to provide a fuel chamber ll, closed'at its lower end by a filling closure l 2 and at its upper end by another closure l3. Within fuel chamber I! may be mounted a barrier l4, preferably of permeable material, having an opening I 5 therein-preferably for the pasber. Extending through an opening, 20 in the tween said burner, said closure and said casing wall thereby further heating the casing and volatilizing the fuel therein.

6. The torch of claim 5 in which the pressure generating tube also extends outwardly through said wall of the casing at a point remote from said burner, then externally of said casing for a portion of its length, and then. inwardly through said casing wall at a point below said closure to communicate with the interior of the casing.

'7. In a torch, a pressure generating unit comprising a casing formed to provide a fuel chamber having a top closure, a barrier within said fuel chamber and spaced from said closure to form a gas chamber, a pressure generating tube lying in part at least above and extending transversely and in close proximity to and in heat exchange relationship with said closure and communicating at its gas intake end with the gas chamber, said casing having a wall portion above said closure, and a perforated combustion burner extendin through said wall of said casing and assembled to the gas outlet end of said tube, said burner lying for a portion of its length above and extending transversely and in close proximity to and in direct heat exchange relationship with said closure so that when the torch is operating heat from said burner is continuously conducted by said tube to the gas chamber and direct heat exchange occurs between said burner, said closure and the casing wall thereby further heating the casing and volatilizin the fuel therein.

8. The torch of claim '7 in which the pressure generating tube also extends outwardly through said wall of the casing at a point remote from said burner, then externally of the casing for a portion of its length, and then inwardly through said casing wall below said top closure to communicate with said gas chamber.

9. In a torch, a pressure generating unit comprising a casing formed to provide a fuel chamber having a top closure, the side Wall of said casing being extended to provide a heating chamber above said closure, a pressure generating tube lying in part at least above and in close proximity to and in heat exchange relationship with said closure and communicating at its gas intake end with the interior of the casing, and a perforated combustion burner extending through the extended portion of the side wall of said casing and assembled to the gas outlet end of said tube, said burner lying for a portion of its length within said heatin chamber and above and in close proximity to and in direct heat exchange relationship with said closure and with said casing wall, so that when the torch is operating heat from said burner is continuously conducted by said tube to the interior of said casing and direct heat exchange occurs between said burner, said closure, and said casing wall thereby further heating the casing and volatilizing the fuel therein.

10. The torch of claim 9 in which the pressure generating tube and the burner each extends for a portion of its length transversely of the heating chamber.

11. The torch of claim 9 in which the pressure generating tube also extends outwardly through the extended portion of the side wall of the casing at a point remote from said burner, then externally of the casing for a portion of its length, and then inwardly through said casing wall to communicate with said fuel chamber.

12. In a torch, a pressure generating unit comprising a casing formed to provide a fuel chamber having a closure at its upper end, the side wall of said casing being extended to provide a. heating chamber above said closure, a barrier within said casing and spaced from said closure to form a gas chamber, a pressure generating tube lying in part at least within said heating chamber above and in close proximity to and in heat exchange relationship with said closure and communicating at its gas intake end with said gas chamber, and a perforated combustion burner extending through the extended portion of the side Wall of said casing and connected to the gas outlet end of said tube, said burner lying for a portion of its length within said heating chamber above and in close proximity to and in direct heat exchange relationship with said closure so that when the torch is operating heat from said burner is conducted by said tube to said gas chamber and direct heat exchange occurs between said burner, said closure and the wall of said casing thereby further heating the casing and volatilizing the fuel therein.

13. The torch of claim 12 in which the pressure enerating tube and the burner each extends for a portion of its length transversely of the heating chamber.

14. The torch of claim 12 in which the pressure generating tube also extends outwardly through the extended portion of the side wall of the casing at a point remote from the burner, then externally of the casing for a portion of its length, and then inwardly through said casing wall to communicate with said gas chamber.

15. In a torch, a pressure generating unit comprising a casing formed to provide a fuel chamber having a closure at its upper and lower ends, the side wall of said casing being extended upwardly beyond the top closure of the fuel chamber to provide a heating chamber above said fuel cham ber, a pressure generating tube extending in part at least within and transversely of said heating chamber and above and in close proximity to said top closure and in direct heat exchange relationship therewith and communicating at its gas intake end with said fuel chamber, a perforated combustion burner extending through the extended portion of the side wall of said casing and assembled to the gas outlet end of said tube, said burner lying for a portion of its length within and transversely of said heating chamber and above and in close proximity to and in direct heat exchange relationship with said top closure, so that when the torch is operating heat from said burner is continuously conducted by said tube to said fuel chamber and direct heat exchange occurs between said burner, said top closure and said side wall of the casing thereby further heatil'lg and volatilizing the fuel therein.

SAMUEL C. BRODY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 382,558 Schlumberger May 8, 1888 764,764 Princen July 12, 1904 1,515,136 Anderson Nov. 11, 1924 1,866,252 Lasher et a1 July 10, 1934 FOREIGN PATENTS Number Country Date 23,131 Great Britain Dec. 18, 1900 

